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  1. Nord Stream dry air purge improves nitrogen-slug use

    Magazine Articles

    Mon, 7 Oct 2013

    about 1,200 km, purging occurred separately on different 122-256 km sections separated by launching and receiving pig trap stations. A constant inlet pressure during air displacement and gas filling provided progressive pipeline pressurization

  2. North Sea Pipelines-1: Extensive subsea commissioning, pigging pose challenges

    Magazine Articles

    Mon, 21 Nov 2005

    received in a 28-in. retrievable pig trap . Operations pigs would have to perform ..... can be justified, and then a subsea pig trap solution is used. Such pig traps ..... discharge should be out of the open pig trap door in the downstream end of the

  1. Subsea isolation techniques advance

    Magazine Articles

    Mon, 1 Feb 2010

    following elements: • Custom-designed pig trap and pigging spread. • High-friction ..... through the riser (Fig. 4). A pig trap and pigging pump launched the high ..... recovered all pigs in the temporary pig trap and closed the ESDV and new valve

  2. SUBSEA PRECOMMISSIONING—1: Nord Stream natural gas pipeline highlights need to integrate precommissioning

    Magazine Articles

    Mon, 6 May 2013

    a 48-in. ball valve, which allowed for the individual launching of the dewatering pigs from Germany. A temporary pig trap installed at the German end of the pipeline launched dewatering pigs using a 48-in. diameter ball valve. The temporary

  3. Methods help remove black powder from gas pipelines

    Magazine Articles

    Mon, 12 Mar 2007

    using the same pig with new caps and gauge plate. The pig trap this time caught 1,600 kg of black powder and the pig ..... back under way required venting gas with powder from the pig trap , creating a sufficient pressure drop across the pig to

  4. Study improves estimation of damage from stuck pigs, hydrates

    Magazine Articles

    Mon, 2 Jul 2012

    the calculation of the pig arrest load on the receiving pig trap door. No published data are available for model validation ..... a gas storage site. The major barrel of the receiving pig trap had a 16-in. diameter. Estimates placed the amount

  5. DRA for gas pipelining successful in Gulf of Mexico trial

    Magazine Articles

    Mon, 5 Jun 2000

    the MO 863A separator and incoming pig trap to determine when the diesel and pig ..... limited by the holding capacity of the pig trap . It would have been better to run ..... form a true batch treatment, but the pig trap was not set up to do that. The same

  6. REFINERY GASES—1: Hydrogen, nitrogen assist compliance with new, tougher environmental regs

    Magazine Articles

    Mon, 23 Nov 2009

    undesired moisture content, contamination of products by residues of the blasting abrasives and environmental problems. A pig trap and nitrogen injection point was installed for this pipeline restoration at Rongellen, Switzerland (Fig. 7) CryoClean

  7. EPNG fined $15.5 million; pipeline rehab ordered

    Online Articles

    Mon, 30 Jul 2007

    cleaning pigs on the system. -- Collect and analyze liquid samples for corrosive properties whenever a pipeline, vessel, pig trap , meter tube, or tank is opened on the system. -- Comply with gas quality guidelines that require monitoring of potentially

  8. Pressure isolation facilitates onshore, offshore maintenance

    Magazine Articles

    Mon, 2 Nov 2009

    for safe isolation procedures before beginning work on existing infrastructure. 4 Initial onshore use of the tool for a pig trap isolation on Vebundnetz Gas Aktiengesellschaft (VNG) roughly 7,000 km natural gas transmission grid in eastern Germany

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